Folks, Has anyone come across a multichannel relay "instant mute"/"delay on" small signal PCB? I need one to mount in an electronic crossover to prevent accidental pops and damage to speaker drivers. 6 channels total. There are loads with high current relays, but I need small signal relays. Cheers.
How do you plan to control them? I have small two channel relay boards but you will need a controller. I use arduino Nano on the adapter board for it (own design). My relay boards design is documented here.
Regards,
Oleg
Regards,
Oleg
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Yes, I came across this Arduino name, but have no clue what it means. Basically I imagine connecting the relay delayed “on” circuit (i.e. lift output from ground) to the positive power supply rails, or maybe a separate rectifier. Instant relay “off” (I.e short output to ground) when power is off.
But a speaker-level DC-fault detector wouldn't be sensitive enough for small signal levels. The whole circuit would need redesignng I think.
Not sure. It should be sufficient with a delay before the crossover output is live, and an instant mute when power to the crossover is lost. DC on the output should not be a problem due to the transformers. I ordered some of those 1 euro delay boards Oleg suggested to see how they might work time and power supply wise. If ok, I can control a battery of of small signal relays...
You could probably go all solid state - see Fig 4 here -
VOM1271 Photovoltaic MOSFET Driver Circuits
Almost the same schematic (using TLP3906 instead of VOM1271)
is used in Post 491 for the Headphone amp DC protection -
Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
All you need are the parts to the right of R21 of the schematic in the above post.
It gives you a small delay controlled by C11 and has a really small part count.
Rod Elliott's site has a lot of very useful information -
ESP - MOSFET Solid State Relays
ESP - MOSFET Solid State Relays
VOM1271 Photovoltaic MOSFET Driver Circuits
Almost the same schematic (using TLP3906 instead of VOM1271)
is used in Post 491 for the Headphone amp DC protection -
Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
All you need are the parts to the right of R21 of the schematic in the above post.
It gives you a small delay controlled by C11 and has a really small part count.
Rod Elliott's site has a lot of very useful information -
ESP - MOSFET Solid State Relays
ESP - MOSFET Solid State Relays
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